KR101232311B1 - Waster heat recovery system with the exhaust gas from the gas combustion unit - Google Patents

Waster heat recovery system with the exhaust gas from the gas combustion unit Download PDF

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KR101232311B1
KR101232311B1 KR1020090085640A KR20090085640A KR101232311B1 KR 101232311 B1 KR101232311 B1 KR 101232311B1 KR 1020090085640 A KR1020090085640 A KR 1020090085640A KR 20090085640 A KR20090085640 A KR 20090085640A KR 101232311 B1 KR101232311 B1 KR 101232311B1
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gas
steam
exhaust gas
water
combustion unit
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KR20110027864A (en
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이철우
이성주
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대우조선해양 주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J3/00—Driving of auxiliaries
    • B63J3/04—Driving of auxiliaries from power plant other than propulsion power plant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
    • F22B1/1807—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines using the exhaust gases of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J99/00—Subject matter not provided for in other groups of this subclass
    • B63J2099/001—Burning of transported goods, e.g. fuel, boil-off or refuse
    • B63J2099/003—Burning of transported goods, e.g. fuel, boil-off or refuse of cargo oil or fuel, or of boil-off gases, e.g. for propulsive purposes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G5/00—Profiting from waste heat of combustion engines, not otherwise provided for
    • F02G5/02—Profiting from waste heat of exhaust gases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/30—Technologies for a more efficient combustion or heat usage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/50—Measures to reduce greenhouse gas emissions related to the propulsion system
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/50—Measures to reduce greenhouse gas emissions related to the propulsion system
    • Y02T70/5218—Less carbon-intensive fuels, e.g. natural gas, biofuels

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

본 발명은 액화천연가스를 탱크에 저장하여 보관하거나 운송하는 과정 중에 발생한 증기기체의 연소열을 회수하는 폐열회수시스템에 관한 것으로, 특히 기존에는 대기 중에 버려지는 가스연소유닛의 고온의 배기가스를 이용함으로써 에너지를 절약할 수 있게 하는 폐열회수시스템에 관한 것이다.The present invention relates to a waste heat recovery system for recovering combustion heat of a vapor gas generated during storage and storage of liquefied natural gas in a tank, and in particular, by using a high temperature exhaust gas of a gas combustion unit that is conventionally discarded in the atmosphere. It relates to a waste heat recovery system that can save energy.

이를 위하여 본 발명의 실시예에 따른 가스연소유닛의 배기가스를 이용한 폐열회수시스템은 증기기체(BOG)를 연소하여 고온의 배기가스를 생성하는 가스연소유닛과, 배기가스와 열교환하여 고온 증기를 생성하고, 고온 증기가 요구되는 사용설비에 공급하는 스팀생성유닛이 포함되는 것을 특징으로 한다.To this end, the waste heat recovery system using the exhaust gas of the gas combustion unit according to the embodiment of the present invention generates a high temperature exhaust gas by combustion of a vapor gas (BOG), and heat exchange with the exhaust gas to generate high temperature steam. And, characterized in that it comprises a steam generating unit for supplying to the use equipment requiring high temperature steam.

GCU, 열회수 GCU, heat recovery

Description

가스연소유닛의 배기가스를 이용한 폐열회수시스템{Waster heat recovery system with the exhaust gas from the gas combustion unit}Waste heat recovery system using exhaust gas of gas combustion unit {Waster heat recovery system with the exhaust gas from the gas combustion unit}

본 발명은 액화천연가스를 탱크에 저장하여 보관하거나 운송하는 과정 중에 발생한 증기기체의 연소열을 회수하는 폐열회수시스템에 관한 것으로, 특히 기존에는 대기 중에 버려지는 가스연소유닛의 고온의 배기가스를 이용함으로써 에너지를 절약할 수 있게 하는 폐열회수시스템에 관한 것이다.The present invention relates to a waste heat recovery system for recovering combustion heat of a vapor gas generated during storage and storage of liquefied natural gas in a tank, and in particular, by using a high temperature exhaust gas of a gas combustion unit that is conventionally discarded in the atmosphere. It relates to a waste heat recovery system that can save energy.

도 3에는 액화천연가스(LNG)를 운송하는 수송선(200)을 개략적으로 도시하였다. 액화천연가스(LNG)는 통상 -167℃ 정도의 극저온을 유지할 수 있는 이송탱크(210)에 담겨져 수송되며, 전용 수송선(200)에는 이송탱크(210)의 저온을 유지하기 위한 장비와 기타 액화천연가스의 운송 중에 발생되는 다양한 상황에 대처하기 위한 설비를 갖추게 된다. 3 schematically shows a transport ship 200 for transporting liquefied natural gas (LNG). Liquefied natural gas (LNG) is usually transported in a transport tank 210 that can maintain a cryogenic temperature of about -167 ℃, the dedicated transport ship 200 and equipment for maintaining the low temperature of the transfer tank 210 and other liquefied natural Equipped with equipment to cope with various situations occurring during transportation of gas.

이러한 수송선(200)에 의하여 장거리 해상 운송되는 과정 중에 이송탱크(210)는 상대적으로 고온인 외부의 영향을 받게 되며, 그에 따라 이송탱크에 저장 중인 액화천연가스는 기화되어 이송탱크의 내부압력을 증대시키게 된다. 이렇게 발생된 증기기체(BOG)에 대하여 적절한 조치를 취함으로써 이송탱크의 내부 압력 상승을 해결할 필요가 있게 된다. During the long-distance maritime transport by the transport ship 200, the transport tank 210 is affected by a relatively high temperature outside, whereby the liquefied natural gas stored in the transport tank is vaporized to increase the internal pressure of the transport tank. Let's go. By taking appropriate measures for the BOG thus generated, it is necessary to solve the internal pressure rise of the transfer tank.

발생되는 증기기체에 대한 조치 중에는 증기기체를 수송선의 추진을 위한 연료로 활용하는 방안, 수송선에 재액화장치를 설치하여 다시 액화천연가스로 상변화시킨 다음 이송탱크에 주입하는 방안 또는 발생된 증기기체를 연소시켜 대기 중으로 배출하는 방안 등이 있다. Among the measures for the generated vapor gas, the method of using the vapor gas as fuel for the propulsion of the transport ship, the re-liquefaction device is installed on the transport ship and the phase change to liquefied natural gas and then injected into the transfer tank or the generated vapor gas Combustion and discharge into the atmosphere.

이 중 재액화장치를 설치하는 방안은 재액화설비의 가격과 차지면적, 운영비용 등의 이유로 경제성이 낮은 단점을 갖는 것이어서, 몇몇 대형 수송선에서 제한적으로 설치 운영되고 있다. Among these, the reliquefaction device has a low economical disadvantage due to the price, occupancy and operating cost of the reliquefaction facility, and is limitedly installed and operated in some large transport ships.

증발기체를 이용하여 수송선의 추진 연료로 활용하는 방안은 널리 사용되고 있는데, 운항 조건에 따라 수송선의 엔진에서 소모되는 양보다 많은 증발기체가 발생되는 경우에는 선박의 가스연소유닛(1)(GCU)을 통하여 태워 방출하는 것이 일반적이다.The method of using evaporation gas as a propulsion fuel of a transport ship is widely used. If more evaporation gas is generated than the amount consumed by the transport engine depending on the operating conditions, the ship's gas combustion unit (1) (GCU) is used. It is common to discharge through burning.

가스연소유닛(1)이 운영될 때에 고온의 배기가스가 다량 방출되므로, 도 3에 도시된 바와 같이, 가스연소유닛(1)은 수송선(200)의 엔진케이싱(220)의 상부에 위치되는 것이 일반적이다. 즉, 가능한 펀넬(230)과 같이 높은 위치에 장착함으로써 다량의 고온 배기가스가 바람에 의하여 퍼지는 경우에도 수송선(200)의 다른 구조물에 미치는 영향을 최소하도록 설치되는 것이다. Since a large amount of hot exhaust gas is released when the gas combustion unit 1 is operated, as shown in FIG. 3, the gas combustion unit 1 is located above the engine casing 220 of the transport ship 200. It is common. That is, by mounting at a high position such as the funnel 230 as possible, even if a large amount of hot exhaust gas is spread by the wind is installed to minimize the effect on other structures of the transport ship 200.

또한, 수송선의 설계 당시에 가스연소유닛의 가동률은 최소화되도록 디자인 되는 것이다. 즉, 통상의 수송선 운영 중에는 전술된 바와 같이 엔진 연료로 사용되는 양 이상의 증기기체가 발생되도록 이송탱크와 냉각장치의 용량을 설계하게 된다. In addition, the operation rate of the gas combustion unit at the time of the design of the transport is designed to minimize. That is, during normal transport operation, as described above, the capacity of the transfer tank and the cooling device is designed to generate more than the amount of vapor gas used as the engine fuel.

그러나 실질적인 선박의 운영은 디자인된 운영조건과 다른 경우가 많다. However, the actual operation of the ship is often different from the designed operating conditions.

일예로 계절변화와 기상변화 등에 따른 주변 대기 및 해수의 높은 온도 조건, 선박의 운항 속도를 운영조건보다 낮게 함으로써 목적지에 도착하는데 소요되는 기간의 증대, 이송탱크에 담겨지는 액화천연가스의 선적량 증대 등 다양의 요인에 의하여 실제 운송되는 기간 중에 증기기체의 발생량은 설계시에 예상하는 발생량보다 많으며, 이에 따라 가스연소유닛의 가동률은 매우 높은 것이다.For example, high temperature conditions of the surrounding air and sea water due to seasonal and weather changes, increase in the time it takes to reach the destination by lowering the operating speed of the vessel lower than the operating conditions, increase in the volume of liquefied natural gas contained in the transfer tank, etc. Due to various factors, the amount of vapor gas generated during the actual transportation period is larger than the amount expected in the design, and thus the operation rate of the gas combustion unit is very high.

이렇게 설계 당시의 예상보다 발생되는 증기기체가 많음으로써 운항 중에 자주 또는 거의 항상 가동되는 가스연소유닛에서 대기 중에 그대로 버려지는 증기기체의 열량은 매우 큰 것이다. Since the amount of steam generated more than expected at the time of design, the amount of heat of the steam gas which is discarded in the air in the gas combustion unit which is frequently or almost always operated during operation is very large.

본 발명은 전술된 현실적 상황을 반영하여, 대기 중에 버려지는 에너지를 재활용 위해 안출된 것으로, 본 발명의 실시예는 증기기체의 연소에 의하여 버려지는 에너지를 수송선에서 재활용하는 목적을 갖는다. The present invention is conceived for recycling the energy discarded in the atmosphere, reflecting the above-described practical situation, an embodiment of the present invention has an object of recycling the energy discarded by the combustion of the steam gas in the transport ship.

보다 구체적으로 기존의 수송선에 구비되는 보일러설비와 교호로 작동될 수 있게 하는 목적을 갖는다.More specifically, the object of the present invention is to alternately operate with a boiler facility provided in an existing transport ship.

상기 과제를 해결하기 위하여, 본 발명은 실시예로 증기기체(BOG)를 연소하여 고온의 배기가스를 생성하는 가스연소유닛과, 상기 배기가스와 열교환하여 고온 증기를 생성하고, 상기 고온 증기가 요구되는 사용설비에 공급하는 스팀생성유닛이 포함되는 것을 특징으로 하는 가스연소유닛의 배기가스를 이용한 폐열회수시스템을 제시한다. In order to solve the above problems, the present invention is a gas combustion unit for generating a high-temperature exhaust gas by burning a vapor gas (BOG) in an embodiment, and generates a high-temperature steam by heat exchange with the exhaust gas, the hot steam is required It proposes a waste heat recovery system using the exhaust gas of the gas combustion unit, characterized in that it comprises a steam generating unit for supplying to the use facility.

또한, 상기 스팀생성유닛에는 내부로 유입된 상기 배기가스를 통하여, 물공급라인으로 유입된 물을 가열하여 배출하는 열교환기와, 상기 열교환기에서 배출된 고온의 기체/액체혼합물에서 고온 증기를 분리하여 사용설비공급라인을 통하여 배출하고, 분리된 물을 이송펌프를 통하여 다시 상기 열교환기에 유입시키는 기액분리기가 구비되는 것을 특징으로 하는 가스연소유닛의 배기가스를 이용한 폐열회수시스템을 제시한다. The steam generating unit may further include a heat exchanger for heating and discharging water introduced into a water supply line through the exhaust gas introduced into the steam generating unit, and separating hot steam from a hot gas / liquid mixture discharged from the heat exchanger. Disclosed is a waste heat recovery system using exhaust gas of a gas combustion unit, comprising a gas-liquid separator for discharging through a facility supply line and introducing the separated water back into the heat exchanger through a transfer pump.

또한, 상기 사용설비는 증기를 이용하여 회전되는 터빈으로 전력을 생성하는 발전설비인 것을 특징으로 하는 가스연소유닛의 배기가스를 이용한 폐열회수시스템을 제시한다. In addition, the use facility proposes a waste heat recovery system using the exhaust gas of the gas combustion unit, characterized in that the power generation facility for generating power to the turbine rotated using steam.

또한, 물을 증기로 상변화하여 상기 사용설비에 공급하는 보일러와, 상기 사용설비를 거쳐 회수되는 증기를 다시 물로 상변화시키는 드레인쿨러와, 상기 드레인쿨러에서 배출되는 물이 저장되며, 상기 보일러에 저장된 물을 공급하는 저장탱크가 포함되는 보일러설비가 구비되고, 상기 스팀생성유닛은 상기 보일러와 병렬되게 구성되는 것을 특징으로 하는 가스연소유닛의 배기가스를 이용한 폐열회수시스템을 제시한다. In addition, a boiler for converting water into steam and supplying it to the facility, a drain cooler for phase-changing steam recovered through the facility, and water discharged from the drain cooler are stored in the boiler. Boiler equipment is provided that includes a storage tank for supplying the stored water, the steam generating unit proposes a waste heat recovery system using the exhaust gas of the gas combustion unit, characterized in that configured in parallel with the boiler.

상술한 바와 같은 본 발명의 실시예에 따른 가스연소유닛의 배기가스를 이용한 폐열회수시스템에 따르면, 기존에 대기 중에 버려졌던 증기기체의 연소열을 회수하여 재활용함으로써 선박의 운영에 소요되는 화석에너지를 줄일 수 있게 되는 효과를 갖는다. 또한, 열교환되면서 배기가스의 온도가 저감되므로, 종래에 고온의 배기가스가 그대로 방출됨으로써 대기와 가스연소유닛 주변의 구조물에 대한 영향이 줄어들게 되는 효과도 갖는다. According to the waste heat recovery system using the exhaust gas of the gas combustion unit according to the embodiment of the present invention as described above, the fossil energy required for the operation of the vessel is reduced by recovering and recycling the combustion heat of the steam gas that has been previously discarded in the atmosphere. Has the effect of being able to. In addition, since the temperature of the exhaust gas is reduced while heat-exchanging, since the high-temperature exhaust gas is conventionally released as it is, the influence on the atmosphere and the structure around the gas combustion unit is also reduced.

특히, 수송선에서 고압 증기를 생성하기 위한 보일러 등의 가동률을 낮출 수 있으므로, 등유 등의 화석연료 사용에 따른 대기오염물질의 생성을 줄일 수 있으며, 그들의 수명을 증대시킬 수 있는 효과를 갖는다.In particular, since the operation rate of a boiler for generating high pressure steam in a transport ship can be lowered, it is possible to reduce the generation of air pollutants caused by the use of fossil fuels such as kerosene, and have an effect of increasing their lifespan.

한편, 기존의 보일러설비와 연동되게 설치됨으로써 가스연소유닛이 가동되지 아니하는 조건에서도 사용설비에 고온 증기를 안정되게 공급할 수 있는 효과를 갖는다. On the other hand, it is installed in conjunction with the existing boiler equipment has the effect that can be stably supply the high temperature steam to the use equipment even under the condition that the gas combustion unit is not operating.

또한, 발전설비에 사용함으로써 수송선의 전력 생산에 소모되는 연료의 사용량을 감소할 수 있어, 수송선의 운영비용을 절감할 수 있는 효과도 갖는다.In addition, the use of the power generation equipment can reduce the amount of fuel consumed to produce the power of the transport, it is also effective to reduce the operating cost of the transport.

이하, 첨부도면의 바람직한 실시예를 통하여, 본 발명인 가스연소유닛의 배기가스를 이용한 폐열회수시스템의 기능, 구성 및 작용을 상세히 설명한다.Hereinafter, through the preferred embodiment of the accompanying drawings, the function, configuration and operation of the waste heat recovery system using the exhaust gas of the gas combustion unit of the present invention will be described in detail.

먼저, 본 발명에서 사용되는 사용설비(4)란 고온의 증기를 유입받아 열원을 사용하거나, 고온의 증기의 압력을 사용하는 설비를 말한다. 구체적인 예로 열원을 이용하는 설비로 액화천연가스를 기체상으로 변화시키는 기화설비가 있고, 증기의 압력을 사용하는 설비로 터빈을 이용한 발전설비가 있다. First, the use facility 4 used in the present invention refers to a facility that receives a high temperature steam and uses a heat source or uses a high pressure steam. As a specific example, a facility using a heat source includes a vaporization facility for converting liquefied natural gas into a gas phase, and a power generation facility using a turbine as a facility using steam pressure.

도 1은 본 발명의 제1실시예에 따른 가스연소유닛의 배기가스를 이용한 폐열회수시스템을 개략적으로 나타낸 흐름도이다.1 is a flowchart schematically showing a waste heat recovery system using exhaust gas of a gas combustion unit according to a first embodiment of the present invention.

본 발명의 제1실시예에 의한 가스연소유닛의 배기가스를 이용한 폐열회수시스템(100)에는 증기기체(BOG)를 연소하여 고온의 배기가스를 생성하는 가스연소유닛(1)과, 상기 배기가스와 열교환하여 고온 증기를 생성하고, 상기 고온 증기가 요 구되는 사용설비(4)에 공급하는 스팀생성유닛(2)이 포함된다. In the waste heat recovery system 100 using the exhaust gas of the gas combustion unit according to the first embodiment of the present invention, a gas combustion unit 1 for generating a high-temperature exhaust gas by burning a vapor gas (BOG), and the exhaust gas And a steam generating unit (2) for generating hot steam by heat exchange with and supplying it to the use facility (4) where the hot steam is required.

가스연소유닛(1)(Gas Combustion Unit, GCU)은 증기기체와 대기 중의 산소를 공급받아 연소시킴으로써 고열의 배기가스를 생성하고, 이를 스팀생성유닛에 공급하게 된다. The gas combustion unit 1 (GCU) generates a high-temperature exhaust gas by burning steam gas and oxygen in the atmosphere, and supplies the same to the steam generating unit.

이때, 스팀생성유닛(2)은 가스연소유닛(1)으로부터 고열의 배기가스를 공급받아 물을 가열하여 고온 증기를 생성하는 것으로, 생성된 고온 증기를 수송선에 구비된 사용설비(4)에 공급하게 된다.At this time, the steam generation unit 2 receives the high-temperature exhaust gas from the gas combustion unit 1 to heat the water to generate high temperature steam, and supply the generated high temperature steam to the facility 4 provided in the transport ship. Done.

이 경우, 종래에는 대기 중에 그대로 버려졌던 가스연소유닛의 배기가스의 열 에너지를 이용함으로써, 고온 증기를 생성하기 위한 보일러 등의 장비에 소모되는 연료의 사용을 절감할 수 있게 된다. 또한, 상기 보일러 등의 운전시간을 줄일 수 있어 장비의 수명이 연장된다. 또한, 보일러 등의 휴지기 동안 화석연료의 사용이 절감되므로 NOx, SOx 계의 대기오염 물질의 배출량이 줄어들게 된다.In this case, it is possible to reduce the use of fuel consumed in equipment such as a boiler for generating high temperature steam by using the thermal energy of the exhaust gas of the gas combustion unit, which has conventionally been discarded in the atmosphere. In addition, it is possible to reduce the operating time of the boiler and the like to extend the life of the equipment. In addition, since the use of fossil fuel is reduced during the rest period of the boiler, the emission of air pollutants of NOx, SOx system is reduced.

구체적으로 스팀생성유닛(2)에는 내부로 유입된 상기 배기가스를 통하여, 물공급라인(211)으로 유입된 물을 가열하여 배출하는 열교환기(21)와, 상기 열교환기(21)에서 배출된 고온의 기체/액체혼합물에서 고온 증기를 분리하여 사용설비공급라인(221)을 통하여 배출하고, 분리된 물을 이송펌프(P)를 통하여 다시 상기 열교환기(21)에 유입시키는 기액분리기(22)가 구비된다.Specifically, the steam generating unit 2 has a heat exchanger 21 for heating and discharging the water introduced into the water supply line 211 through the exhaust gas introduced into the steam generation unit 2, and discharged from the heat exchanger 21. The gas-liquid separator 22 which separates high-temperature steam from the hot gas / liquid mixture and discharges it through the use equipment supply line 221 and introduces the separated water back into the heat exchanger 21 through the transfer pump P. Is provided.

열교환기(21)는 고열의 배기가스를 유입받고, 기액분리기(22)를 통하여 공급된 물을 유입받아 이를 가열하여 고온의 기체/액체혼합물을 생성하는 것으로, 통상적인 열교환 장치의 구성을 가질 수 있다. 이러한 열교환기(21)를 거친 배기가스는 대기 중으로 방출되는데, 이때 배기가스는 열교환기를 거침으로써 온도가 낮아져 주변 대기에 미치는 영향을 낮출 수 있게 된다.The heat exchanger 21 receives the high-temperature exhaust gas, receives the water supplied through the gas-liquid separator 22, and heats it to generate a high temperature gas / liquid mixture. The heat exchanger 21 may have a conventional heat exchanger. have. The exhaust gas passing through the heat exchanger 21 is discharged into the atmosphere. At this time, the exhaust gas passes through the heat exchanger to lower the temperature, thereby reducing the influence on the surrounding atmosphere.

한편, 기액분리기(22)에서는 열교환기(21)에 배출된 고온의 기체/액체혼합물이 기체(고온 증기)와 액체(물)를 분리되고, 고온 증기는 사용설비공급라인(221)을 통하여 사용설비(4)에 공급된다. 한편, 분리된 물은 이송펌프(P)를 통하여 다시 열교환기(21)로 공급된다. 이러한 기액분리기는 공지된 구성을 갖는다. On the other hand, in the gas-liquid separator 22, the hot gas / liquid mixture discharged to the heat exchanger 21 separates the gas (hot steam) and the liquid (water), and the hot steam is used through the facility supply line 221. Supplied to facility (4). On the other hand, the separated water is supplied back to the heat exchanger 21 through the transfer pump (P). Such gas-liquid separators have a known configuration.

이때, 사용설비(4)에서 사용된 후 액화되어 회수되는 물은 그대로 버려지거나, 도시된 바와 같이 기액분리기(22)를 거쳐 회수되어 다시 열교환기(21)로 공급될 수 있다. At this time, the water liquefied and recovered after being used in the use facility 4 may be discarded as it is, or may be recovered through the gas-liquid separator 22 and supplied to the heat exchanger 21 again.

이송펌프(P)는 어느 하나의 펌프의 고장, 수리시에 대비하여 한 쌍이 병렬되게 설치되며, 각 이송펌프(P)의 전후에는 밸브가 결합되어 있는 것이다. 이러한 이송펌프는 유체 이송 펌프로 공지된 구성을 갖는다.Transfer pump (P) is a pair is installed in parallel in case of failure, repair of any one pump, the valve is coupled before and after each transfer pump (P). Such a transfer pump has a configuration known as a fluid transfer pump.

한편, 기존에 수송선에 구비되어 증기를 사용설비에 공급하는 보일러설비(3)에 더하여 본 발명에 따른 스팀생성유닛(2)이 연동되게 설치될 수 있다.On the other hand, in addition to the boiler facility (3) that is provided in the existing transport ship to supply the steam to the facility, the steam generating unit (2) according to the present invention can be installed to be interlocked.

구체적으로 보일러설비(3)에는 물을 증기로 상변화하여 상기 사용설비(4)에 공급하는 보일러(31)와, 상기 사용설비(4)를 거쳐 회수되는 증기를 다시 물로 상변화시키는 드레인쿨러(32)와, 상기 드레인쿨러(32)에서 배출되는 물이 저장되며, 상기 보일러(31)에 저장된 물을 공급하는 저장탱크(33)가 포함되는 것이다. Specifically, the boiler facility (3) has a boiler (31) for changing the water phase to steam to supply to the use facility (4), and a drain cooler for phase-changing the steam recovered through the use facility (4) again with water ( 32 and a storage tank 33 for storing the water discharged from the drain cooler 32 and supplying the water stored in the boiler 31.

이때, 보일러(31)는 등유, 경유 등 오일류의 화석연료를 사용함으로써 열원을 생성하고, 이 열원으로 물을 증기로 상변화시켜 사용설비에 공급하는 것이다. At this time, the boiler 31 generates a heat source by using fossil fuels of oils such as kerosene and diesel, and changes the water into steam as the heat source to supply the used equipment.

보일러(31)에서 생성되어 사용설비(4)를 거친 고온의 증기는 일부는 액화되어 기체/액체 혼합물의 상태로 드레인쿨러(32)에 유입된다. 드레인쿨러(32)에서는 남은 증기를 액화시켜 물이 생성되며, 이렇게 생성된 물은 저장탱크(33)로 이송되어 저장된다. The hot steam generated in the boiler 31 and passed through the facility 4 is partly liquefied and flows into the drain cooler 32 in the form of a gas / liquid mixture. The drain cooler 32 generates water by liquefying the remaining steam, and the generated water is transferred to and stored in the storage tank 33.

저장탱크(33)는 이송펌프(P)에 의하여 가압된 후 다시 보일러(31)로 유입되어 물은 순환되는 구성을 갖는다.The storage tank 33 is pressurized by the transfer pump P, and then flows back into the boiler 31 to circulate water.

이러한 보일러설비(3)에서 증기를 생성하는 보일러(31)를 대체하여, 전술된 스팀생성유닛(2)이 병렬되게 구성되는 것이다.In place of the boiler 31 for generating steam in the boiler facility 3, the above-described steam generating unit 2 is configured in parallel.

구체적으로 기액분리기(22)에서 고온 증기가 배출되는 사용설비공급라인(221)의 보일러의 증기배출라인(311)과 연통되고, 저장탱크(33)에서 공급되는 물은 보일러(31) 또는 기액분리기(22) 또는 열교환기(21)에 바로에 공급될 수 있게 구성된다. Specifically, the gas-liquid separator 22 communicates with the steam discharge line 311 of the boiler of the facility supply line 221 to discharge the hot steam, and the water supplied from the storage tank 33 is the boiler 31 or the gas-liquid separator. 22 or the heat exchanger 21 is configured to be supplied directly to.

이로써, 가스연소유닛(1)이 가동되지 아니하는 경우에는 보일러(31)를 가동하여 사용설비(4)에 고온의 증기를 공급하고, 가스연소유닛(1)이 가동되는 경우에 는 보일러(31)를 가동하지 아니하여 전술된 바와 같이 화석연료의 절감 및 보일러의 수명연장의 효과를 얻게 된다. 물론, 가스연소유닛에서 얻어지는 열량이 충분하지 아니하여 다량의 고온 증기를 생성하기 어려운 때에는 보일러를 약하게 함께 가동함으로써 서로 보충될 수 있게 운영될 수도 있는 것이다. Thus, when the gas combustion unit 1 is not operated, the boiler 31 is operated to supply high temperature steam to the use facility 4, and when the gas combustion unit 1 is operated, the boiler 31 is operated. As a result, the reduction of fossil fuel and the life of the boiler can be extended as described above. Of course, when the amount of heat obtained from the gas combustion unit is not enough to produce a large amount of high temperature steam, it may be operated to supplement each other by running the boilers together weakly.

도 2는 본 발명의 제2실시예에 따른 가스연소유닛의 배기가스를 이용한 폐열회수시스템을 개략적으로 나타낸 흐름도이다. 2 is a flowchart schematically showing a waste heat recovery system using exhaust gas of a gas combustion unit according to a second embodiment of the present invention.

제2실시예의 구성과 작용은 이하 설명되는 부분을 제외하고는 전술된 제1실시예와 동일하므로 중복된 설명은 생략하기로 한다. Since the configuration and operation of the second embodiment are the same as those of the first embodiment described above except for the parts described below, duplicated descriptions will be omitted.

제2실시예에서의 사용설비(4)는 증기를 이용하여 회전되는 터빈(51)으로 전력을 생성하는 발전설비(5)일 수 있다.The use facility 4 in the second embodiment may be a power generation facility 5 that generates power to the turbine 51 which is rotated using steam.

이러한 발전설비(5)를 가동하기 위해서 고압의 증기가 요구되는 것으로, 기액분리기(22)에서 배출되는 고온 증기를 열교환기(21)로 재 유입하여 더욱 고온, 고압의 증기를 생성하고, 이를 터빈(51)에 공급한다. High-pressure steam is required to operate the power plant 5, and the high-temperature steam discharged from the gas-liquid separator 22 is re-introduced into the heat exchanger 21 to generate steam at a higher temperature and higher pressure. It supplies to 51.

터빈(51)을 회전시킨 고온 고압의 증기는 응축기(52)를 통하여 액화되고, 액화된 물은 이송펌프(P)를 통하여 저장탱크(33)로 이송하도록 구성된다. The high temperature and high pressure steam rotating the turbine 51 is liquefied through the condenser 52, and the liquefied water is configured to be transferred to the storage tank 33 through the transfer pump P.

이렇게 스팀생성유닛을 통하여 발전설비를 가동하여 전력을 얻게 되므로, 동일한 고온 고압의 증기를 얻기 위하여 보일러를 가동하여야 하는데서 발생되는 유지비를 절감할 수 있게 되는 것이다. Since power is obtained by operating the power generation facility through the steam generating unit, it is possible to reduce the maintenance costs incurred by operating the boiler to obtain the same high temperature and high pressure steam.

도 1은 본 발명의 제1실시예에 따른 가스연소유닛의 배기가스를 이용한 폐열회수시스템을 개략적으로 나타낸 흐름도.1 is a flow chart schematically showing a waste heat recovery system using exhaust gas of a gas combustion unit according to a first embodiment of the present invention.

도 2는 본 발명의 제2실시예에 따른 가스연소유닛의 배기가스를 이용한 폐열회수시스템을 개략적으로 나타낸 흐름도.2 is a flow chart schematically showing a waste heat recovery system using exhaust gas of a gas combustion unit according to a second embodiment of the present invention.

도 3은 액화천연가스를 운송하기 위한 수송선을 대략적으로 나타낸 도면.Figure 3 is a diagram schematically showing a transport for transporting liquefied natural gas.

* 도면의 주요부분에 대한 부호의 설명 *Description of the Related Art [0002]

100 : 폐열회수시스템100: waste heat recovery system

1 : 가스연소유닛1: gas combustion unit

2 : 스팀생성유닛2: steam generating unit

21 : 열교환기 211 : 물공급라인21: heat exchanger 211: water supply line

22 : 기액분리기 221 : 사용설비공급라인22: gas-liquid separator 221: use equipment supply line

3 : 보일러설비3: boiler equipment

31 : 보일러 311 : 증기배출라인 32 : 드레인쿨러31: boiler 311: steam discharge line 32: drain cooler

33 : 저장탱크33: storage tank

4 : 사용설비4: Equipment used

5 : 발전설비5: power generation equipment

51 : 터빈 52 : 응축기51 turbine 52 condenser

P : 이송펌프P: transfer pump

Claims (4)

증기기체(BOG)를 연소하여 고온의 배기가스를 생성하는 가스연소유닛과, 상기 배기가스와 열교환하여 고온 증기를 생성하고 상기 고온 증기가 요구되는 사용설비에 공급하는 스팀생성유닛을 포함하는 가스연소유닛의 배기가스를 이용한 폐열회수시스템에 있어서,Gas combustion unit comprising a gas combustion unit for burning a hot gas (BOG) to generate a high temperature exhaust gas, and a steam generation unit for generating a high temperature steam by heat exchange with the exhaust gas and supplying to the use facility requiring the high temperature steam In the waste heat recovery system using the exhaust gas of the unit, 상기 사용설비(4)는 증기를 이용하여 회전되는 터빈(51)으로 전력을 생성하는 발전설비(5)이며,The use facility (4) is a power generation facility (5) for generating power to the turbine 51 is rotated using steam, 물을 증기로 상변화하여 상기 사용설비(4)에 공급하는 보일러(31)와, 상기 사용설비(4)를 거쳐 회수되는 증기를 다시 물로 상변화시키는 드레인쿨러(32)와, 상기 드레인쿨러(32)에서 배출되는 물이 저장되며, 상기 보일러(31)에 저장된 물을 공급하는 저장탱크(33)가 포함되는 보일러설비(3)가 구비되고,The boiler 31 which phase-changes water into steam and supplies it to the use facility 4, the drain cooler 32 which phase-changes steam recovered through the use facility 4 back into water, and the drain cooler ( The water discharged from the 32 is stored, and the boiler facility 3 includes a storage tank 33 for supplying the water stored in the boiler 31, 상기 스팀생성유닛(2)은 상기 보일러(31)와 병렬되게 구성되며,The steam generating unit 2 is configured in parallel with the boiler 31, 상기 스팀생성유닛(2)에는 The steam generation unit (2) 내부로 유입된 상기 배기가스를 통하여, 물공급라인(211)으로 유입된 물을 가열하여 배출하는 열교환기(21)와, A heat exchanger 21 for heating and discharging the water introduced into the water supply line 211 through the exhaust gas introduced into the inside; 상기 열교환기(21)에서 배출된 고온의 기체/액체혼합물에서 고온 증기를 분리하여 사용설비공급라인(221)을 통하여 배출하고, 분리된 물을 이송펌프(P)를 통하여 다시 상기 열교환기(21)에 유입시키는 기액분리기(22)가 구비되는 것을 특징으로 하는 가스연소유닛의 배기가스를 이용한 폐열회수시스템.The hot steam is separated from the hot gas / liquid mixture discharged from the heat exchanger 21 and discharged through the use equipment supply line 221, and the separated water is again transferred through the transfer pump P. Waste heat recovery system using the exhaust gas of the gas combustion unit, characterized in that it is provided with a gas-liquid separator 22 to flow into. 삭제delete 삭제delete 삭제delete
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